Boiler



June 7, 1927. 1,631,328

F. o. PAHMEYER BOILER Filed Aug. 4, 1923 INVENTOR FRED 0. PAHMEYER r x BY 7 ATTORNE 0 jec-ting Patented June 7, 1927.

FREDERICK O.

PAHMEYER, OF ST. LOUIS, MISSOURI, ASSIGNOR TO HEIN'E BOILER COMPANY, OF ST; LOUIS, MISSOURI, A CORPORATION OF MISSOURI.

BOILER..

Application filed August 4, 1923. Serial No. 655,665.

This invention relates to multiple bank water tube boilers of the type that comprise sectional headers, arrangedin proximity to each other and joined together by nipples that establish communication between said headers.

In conventional water tube boilers, straight nipples are now used for connecting the adjacent headers of the boiler together, thereby making it necessary to bodily move one header relatively to the other in order to arrange a nipple between the headers with the end portions of the nipple positioned in the holes provided for. same inthe headers. In some instances the operation of renewing or replacing a defective nipple results in the destruction ofseveral good nipples and often causes the baflles of the boiler to be damaged. For example, in a boiler equipped with sectional serpentine headers and provided with three tube banks arranged one above the other, the operation of renewing a nipple 'hat' is used for connecting the header of the middle bank to the header arranged directly above or below same, consists in first cutting the two upper nipples and the two lower nipples at the opposite ends of the section to which the nipple is connected and then bodily shifting the water tubes and headers constituting said section en'dwise into such a position that the header at one end of the section projects outwardly far enough to permit new nipples to be introduced into the top. and bottom of the proheader and temporarily held in place. The entire section is then moved endwise in the opposite direction, so as to cause the other header of the section to project outwardly far enough to permit new nipples to be introduced into the top and bottom of the header and temporarily held in place.

I The section is then moved back into its orig inal position and the four nipples that were inserted in the top and bottom of the two headers at the opposite ends of the section are then positioned properly and expanded so as to connect said headers to the co-operating headers of the adjacent banks. It will thus be seen that in a boiler equipped with sectional serpentine headers, the replacement of one defective nipple often necessitates the destruction of three good nipples, it requires four nipples to be expanded and it often results in injury to the baffles of the boiler, caused by the longitudinal or endwise movement of the section whose nipple had'to be replaced.

, The object of my invention is to overcome thenecessity of disturbing or changingthe position of one or the other of two adjacent boiler headers that are joined together by nipples during the operation of replacing a nipple or arranging a nipple in operative engagement with the headers preparatory to expanding the ends of the nipple to connect it to the headers. I accomplish this by using slightly curved nipples to connect adj acent headers of a boiler, and making the -portions of the headers that contain the nipple holes of such shape or form that one end portion of the nipple can be inserted in the hole provided for same in one header and the nipple thereafter twisted or turned so as to bring the opposite end portion of the nipple into such a'position with relation to the hole provided for same in the other header that the nipple can be inserted in said hole, thereby causing tlie'opposite end portions of the nipple to be arranged. in operative engagement with the headers, after which the nipple can be expanded so as to connect it to the headers. By constructing the boiler in this way I not only greatly siniplify the operation of replacing a defective nipple in a boiler, but I also overcome the necessity of destroying several good nipples, when replacing a defective nipple in a boiler equipped with sectional headers, inate the possibility of injuring the baflles of the boiler, as so often occurs when one section of a sectional header boiler is shifted endwise during the operation of replacing a defective nipple.

The portions of the headers that contain the nipple holes can be of various forms, but I prefer to construct the nipple hole portions of the header in such a way that the two opposed parts of two adjacent headers which are oined together by a nipple will be inclined oppositely to each other and each disposed .at substantially right angles to the end portion of the nipple that is connected to same, thereby enabling a curved nipple to be arranged in operative engagement with both of said parts by manipulating the nipple in the manner hereinafter described.

Figure 1 of the drawings is a vertical longitudinal sectional view of a water tube boiler constructed in accordance with my invention; and

and elim- Figure 2 is an enlarged vertical sectional view of portions of two adjacent headers of the boiler, illustrating the method of arranging a nipple in operative engagement with said headers.

Referring to the drawings, A designates water tubes arranged so as to form a plurality of superimposed tube banks, B designates vertically-disposed sectional headers arranged at the ends of said banks and connected to the water tubes A, and C designates curved nipples that are used to join or connect together the aligned headers of the upper bank and the intermediate bank and to join the aligned headers of the intermediate bank and the lower bank. As shown in the drawings, each header of the intermediate bank is provided at its upperend with an inclined tube hole portion 1 tnat contains a hole which is adapted to receive the lower end portion a of one of the nipples C, and each header of the upper bank is provided at its lower end with an oppositely-inclined tube hole portion 2 that contains a hole which is adapted to receive the upper end portion 3 of the nipple that is used to join said header to the verticallynlignedheader of the middle bank. To arrange the nipple G in operative engagement with two vertical ly-aligned headers of the upper bank and the middle bank, the nipple is first arranged in the position shown in dotted lines in l igure 2 so that the lower end portion. :0 of the nipple can be inserted in the hole provided for same in the inclined tube hole portion 1 atthe upper end of the header of the middle bank by moving the nipple downwardly into said hole, the upper end portion y of the nipple being disposed at such an angle at this time, as shown in broken lines in Figure 2, that it will not contact with or bear against the vertically-aligned header of the upper bank. The nipple is then given a half turn into the position shown in full lines in Figure 2, so as to arrange the upper end portion 7 of same in alignment with the hole in the inclined portion 2 at the lower end of the vertically-aligned header of the upper bank, and thereafter the nipple is moved upwardly so as to introduce the upper end portions of same into said hole.

vided at their lower ends with nipple hole portions, designated by the reference character 2 in Figure 1, that are inclined at the same angle as the nipple hole portions 2 at the lower ends of the headers of the upper bank, and the headers of the lower bank are provided at their upper ends with nipple hole portions, designated by the reference character 1 in Figure 1, that are disposed atthe same angle as the nipple hole portions -1 at the upper ends of the headers of the middle bank, thereby enabling the headers of the middle bank to be connected. by curved nipples with the vertically-aligned headers of the lower bank in the manner previously described.

lVhile the primary object of my invention is. to enable a defective boiler nipple to be replaced quickly and withoutthe necessity of destroying other good nipples or injuring the battles of the boiler, my invention is of value in the construction of new boilers, as it enables the tubes of each bank tobe connected with their headers, the headers of the respective banks thereafter arranged in superimposed relation and blocked apart,

and curved nipples thereafter arranged in operative engagement with the verticallyaligned headers and connected to same by expanding the ends of the nipples.

Having thus described my invention,

what I claim as new and Letters Patent is: A water tube boiler provided with a plurality of superimposed tube banks, sectional headers at the front and rear ends of each of said tube banks, and curved nipples that connect the headers of one bank with the aligned headers of an adjacent bank, the opposed end faces of the two headers to which each nipple is connected being disposed at an angle to the longitudinal axes of the headers and being oppositely inclined for the purpose described.

FREDERICK O. PAHMEYER.

desire to secure by 

